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<h1 class="page-title">Source: Models/MagdaCatalogItem.js</h1>
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<pre class="prettyprint source linenums"><code>"use strict";
/*global require*/
var ArcGisFeatureServerCatalogItem = require("terriajs/lib/Models/ArcGisFeatureServerCatalogItem");
var ArcGisMapServerCatalogItem = require("terriajs/lib/Models/ArcGisMapServerCatalogItem");
var CatalogItem = require("terriajs/lib/Models/CatalogItem");
var clone = require("terriajs-cesium/Source/Core/clone");
var createRegexDeserializer = require("terriajs/lib/Models/createRegexDeserializer");
var createRegexSerializer = require("terriajs/lib/Models/createRegexSerializer");
var CsvCatalogItem = require("terriajs/lib/Models/CsvCatalogItem");
var CzmlCatalogItem = require("terriajs/lib/Models/CzmlCatalogItem");
var defined = require("terriajs-cesium/Source/Core/defined");
var defineProperties = require("terriajs-cesium/Source/Core/defineProperties");
var freezeObject = require("terriajs-cesium/Source/Core/freezeObject");
var GeoJsonCatalogItem = require("terriajs/lib/Models/GeoJsonCatalogItem");
var inherit = require("terriajs/lib/Core/inherit");
var KmlCatalogItem = require("terriajs/lib/Models/KmlCatalogItem");
var loadJson = require("../Core/loadJson");
var Metadata = require("terriajs/lib/Models/Metadata");
var TerriaError = require("terriajs/lib/Core/TerriaError");
var proxyCatalogItemUrl = require("terriajs/lib/Models/proxyCatalogItemUrl");
// var Rectangle = require('terriajs-cesium/Source/Core/Rectangle');
var URI = require("urijs");
var WebMapServiceCatalogGroup = require("terriajs/lib/Models/WebMapServiceCatalogGroup");
var WebMapServiceCatalogItem = require("terriajs/lib/Models/WebMapServiceCatalogItem");
var WebFeatureServiceCatalogGroup = require("terriajs/lib/Models/WebFeatureServiceCatalogGroup");
var WebFeatureServiceCatalogItem = require("terriajs/lib/Models/WebFeatureServiceCatalogItem");
var when = require("terriajs-cesium/Source/ThirdParty/when");
var knockout = require("terriajs-cesium/Source/ThirdParty/knockout");
/**
* A {@link CatalogItem} that queries a MAGDA server for a dataset or distribution, and then accesses
* that the as WMS, GeoJSON, etc. depending on what it finds.
*
* @alias MagdaCatalogItem
* @constructor
* @extends CatalogItem
*
* @param {Terria} terria The Terria instance.
*/
function MagdaCatalogItem(terria) {
CatalogItem.call(this, terria);
/**
* Gets or sets the ID of the MAGDA distribution referred to by this catalog item. Either this property
* or {@see MagdaCatalogItem#datasetId} must be specified. If {@see MagdaCatalogItem#datasetId} is
* specified too, and this distribution is not found, _any_ supported distribution may be used instead,
* depending on the value of {@see MagdaCatalogItem#allowAnyDistributionIfDistributionIdNotFound}.
* @type {String}
*/
this.distributionId = undefined;
/**
* Gets or sets the ID of the MAGDA dataset referred to by this catalog item. Either this property
* is {@see MagdaCatalogItem#distributionId} must be specified. The first distribution of a supported type
* in this dataset will be used.
* @type {String}
*/
this.datasetId = undefined;
/**
* Gets or sets a value indicating whether any supported distribution may be used if both {@see MagdaCatalogItem#datasetId} and
* {@see MagdaCatalogItem#distributionId} are specified and the {@see MagdaCatalogItem#distributionId} is not found.
* @type {Boolean}
* @default true
*/
this.allowAnyDistributionIfDistributionIdNotFound = true;
/**
* Gets or sets a value indicating whether this may be a WMS distribution.
* @type {Boolean}
* @default true
*/
this.allowWms = true;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is a WMS distribution.
* @type {RegExp}
*/
this.wmsDistributionFormat = /^wms$/i;
/**
* Gets or sets a value indicating whether this may be a WFS distribution.
* @type {Boolean}
* @default true
*/
this.allowWfs = true;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is a WFS distribution.
* @type {RegExp}
*/
this.wfsDistributionFormat = /^wfs$/i;
/**
* Gets or sets a value indicating whether this may be a KML distribution.
* @type {Boolean}
* @default true
*/
this.allowKml = true;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is a KML distribution.
* @type {RegExp}
*/
this.kmlDistributionFormat = /^km[lz]$/i;
/**
* Gets or sets a value indicating whether this may be a CSV distribution.
* @type {Boolean}
* @default true
*/
this.allowCsv = true;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is a CSV distribution.
* @type {RegExp}
*/
this.csvDistributionFormat = /^csv(-geo-)?/i;
/**
* Gets or sets a value indicating whether this may be an Esri MapServer distribution.
* @type {Boolean}
* @default true
*/
this.allowEsriMapServer = true;
/**
* Gets or sets a value indicating whether this may be an Esri FeatureServer distribution.
* @type {Boolean}
* @default true
*/
this.allowEsriFeatureServer = true;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is an Esri MapServer distribution.
* A valid MapServer distribution must also have `MapServer` in its URL.
* @type {RegExp}
*/
this.esriMapServerDistributionFormat = /^esri rest$/i;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is an Esri
* MapServer or FeatureServer distribution. A valid FeatureServer distribution must also have `FeatureServer` in its URL.
* @type {RegExp}
*/
this.esriFeatureServerDistributionFormat = /^esri rest$/i;
/**
* Gets or sets a value indicating whether this may be a GeoJSON distribution.
* @type {Boolean}
* @default true
*/
this.allowGeoJson = true;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is a GeoJSON distribution.
* @type {RegExp}
*/
this.geoJsonDistributionFormat = /^geojson$/i;
/**
* Gets or sets a value indicating whether this may be a CZML distribution.
* @type {Boolean}
* @default true
*/
this.allowCzml = true;
/**
* Gets or sets a regular expression that, when it matches a distribution's format, indicates that the distribution is a CZML distribution.
* @type {RegExp}
*/
this.czmlDistributionFormat = /^czml$/i;
/**
* Gets or sets a hash of properties that will be set on the item created from the MAGDA distribution.
* For example, { "treat404AsError": false }
* @type {Object}
*/
this.itemProperties = undefined;
}
inherit(CatalogItem, MagdaCatalogItem);
defineProperties(MagdaCatalogItem.prototype, {
/**
* Gets the type of data member represented by this instance.
* @memberOf MagdaCatalogItem.prototype
* @type {String}
*/
type: {
get: function() {
return "magda-distribution";
}
},
/**
* Gets a human-readable name for this type of data source, 'MAGDA Distribution'.
* @memberOf MagdaCatalogItem.prototype
* @type {String}
*/
typeName: {
get: function() {
return "MAGDA Distribution";
}
},
/**
* Gets the metadata associated with this data source and the server that provided it, if applicable.
* @memberOf MagdaCatalogItem.prototype
* @type {Metadata}
*/
metadata: {
get: function() {
var result = new Metadata();
result.isLoading = false;
result.dataSourceErrorMessage =
"This data source does not have any details available.";
result.serviceErrorMessage =
"This service does not have any details available.";
return result;
}
},
/**
* Gets the set of functions used to update individual properties in {@link CatalogMember#updateFromJson}.
* When a property name in the returned object literal matches the name of a property on this instance, the value
* will be called as a function and passed a reference to this instance, a reference to the source JSON object
* literal, and the name of the property.
* @memberOf MagdaCatalogItem.prototype
* @type {Object}
*/
updaters: {
get: function() {
return MagdaCatalogItem.defaultUpdaters;
}
},
/**
* Gets the set of functions used to serialize individual properties in {@link CatalogMember#serializeToJson}.
* When a property name on the model matches the name of a property in the serializers object literal,
* the value will be called as a function and passed a reference to the model, a reference to the destination
* JSON object literal, and the name of the property.
* @memberOf MagdaCatalogItem.prototype
* @type {Object}
*/
serializers: {
get: function() {
return MagdaCatalogItem.defaultSerializers;
}
}
});
/**
* Gets or sets the set of default updater functions to use in {@link CatalogMember#updateFromJson}. Types derived from this type
* should expose this instance - cloned and modified if necesary - through their {@link CatalogMember#updaters} property.
* @type {Object}
*/
MagdaCatalogItem.defaultUpdaters = clone(CatalogItem.defaultUpdaters);
MagdaCatalogItem.defaultUpdaters.wmsDistributionFormat = createRegexDeserializer(
"wmsDistributionFormat"
);
MagdaCatalogItem.defaultUpdaters.wfsDistributionFormat = createRegexDeserializer(
"wfsDistributionFormat"
);
MagdaCatalogItem.defaultUpdaters.kmlDistributionFormat = createRegexDeserializer(
"kmlDistributionFormat"
);
MagdaCatalogItem.defaultUpdaters.csvDistributionFormat = createRegexDeserializer(
"csvDistributionFormat"
);
MagdaCatalogItem.defaultUpdaters.esriMapServerDistributionFormat = createRegexDeserializer(
"esriMapServerDistributionFormat"
);
MagdaCatalogItem.defaultUpdaters.esriFeatureServerDistributionFormat = createRegexDeserializer(
"esriFeatureServerDistributionFormat"
);
MagdaCatalogItem.defaultUpdaters.geoJsonDistributionFormat = createRegexDeserializer(
"geoJsonDistributionFormat"
);
MagdaCatalogItem.defaultUpdaters.czmlDistributionFormat = createRegexDeserializer(
"czmlDistributionFormat"
);
freezeObject(MagdaCatalogItem.defaultUpdaters);
/**
* Gets or sets the set of default serializer functions to use in {@link CatalogMember#serializeToJson}. Types derived from this type
* should expose this instance - cloned and modified if necesary - through their {@link CatalogMember#serializers} property.
* @type {Object}
*/
MagdaCatalogItem.defaultSerializers = clone(CatalogItem.defaultSerializers);
MagdaCatalogItem.defaultSerializers.wmsDistributionFormat = createRegexSerializer(
"wmsDistributionFormat"
);
MagdaCatalogItem.defaultSerializers.wfsDistributionFormat = createRegexSerializer(
"wfsDistributionFormat"
);
MagdaCatalogItem.defaultSerializers.kmlDistributionFormat = createRegexSerializer(
"kmlDistributionFormat"
);
MagdaCatalogItem.defaultSerializers.csvDistributionFormat = createRegexSerializer(
"csvDistributionFormat"
);
MagdaCatalogItem.defaultSerializers.esriMapServerDistributionFormat = createRegexSerializer(
"esriMapServerDistributionFormat"
);
MagdaCatalogItem.defaultSerializers.esriFeatureServerDistributionFormat = createRegexSerializer(
"esriFeatureServerDistributionFormat"
);
MagdaCatalogItem.defaultSerializers.geoJsonDistributionFormat = createRegexSerializer(
"geoJsonDistributionFormat"
);
MagdaCatalogItem.defaultSerializers.czmlDistributionFormat = createRegexSerializer(
"czmlDistributionFormat"
);
freezeObject(MagdaCatalogItem.defaultSerializers);
/**
* Creates a catalog item from a MAGDA distribution.
*
* @param {Terria} options.terria The Terria instance.
* @param {Object} options.distribution The MAGDA distribution JSON.
* @param {String} options.magdaBaseUrl The base URL of the MAGDA server.
* @param {String} [options.parent] The parent of this catalog item.
* @param {RegExp} [options.wmsDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is a WMS distribution. If undefined, WMS distributions will not be returned.
* @param {RegExp} [options.wfsDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is a WFS distribution. If undefined, WFS distributions will not be returned.
* @param {RegExp} [options.esriMapServerDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is an Esri MapServer distribution. If undefined, Esri MapServer distributions will not be returned.
* @param {RegExp} [options.esriFeatureServerDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is an Esri FeatureServer distribution. If undefined, Esri FeatureServer distributions will not be returned.
* @param {RegExp} [options.kmlDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is a KML distribution. If undefined, KML distributions will not be returned.
* @param {RegExp} [options.geoJsonDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is a GeoJSON distribution. If undefined, GeoJSON distributions will not be returned.
* @param {RegExp} [options.csvDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is a CSV distribution. If undefined, CSV distributions will not be returned.
* @param {RegExp} [options.czmlDistributionFormat] A regular expression that, when it matches a distribution's format, indicates that the distribution
* is a CZML distribution. If undefined, CZML distributions will not be returned.
* @param {Boolean} [options.allowWmsGroups=false] True to allow this function to return WMS groups in addition to items. For example if the distribution
* refers to a WMS server but no layer is available, a {@see WebMapServiceCatalogGroup} for the
* server will be returned.
* @param {Boolean} [options.allowWfsGroups=false] True to allow this function to return WFS groups in addition to items. For example if the distribution
* refers to a WFS server but no layer is available, a {@see WebFeatureServiceCatalogGroup} for the
* server will be returned.
* @param {Boolean} [options.useDistributionName=false] True to use the name of the distribution for the name of the catalog item; false to use the
* name of the dataset.
* @param {String} [options.dataCustodian] The data custodian to use, overriding any that might be inferred from the MAGDA dataset.
* @param {Object} [options.itemProperties] Additional properties to apply to the item once created.
* @return {Promise<CatalogMember>} A promise to the created catalog member, or a promise to undefined if no catalog member could be created from the distribution.
*/
MagdaCatalogItem.createCatalogItemFromDistribution = function(options) {
var distribution = options.distribution;
var parent = options.parent;
var formats = [
// Format Regex, Catalog Item, (optional) URL regex
[options.wmsDistributionFormat, WebMapServiceCatalogItem],
[options.wfsDistributionFormat, WebFeatureServiceCatalogItem],
[
options.esriMapServerDistributionFormat,
ArcGisMapServerCatalogItem,
/MapServer/
],
[
options.esriFeatureServerDistributionFormat,
ArcGisFeatureServerCatalogItem,
/FeatureServer/
],
[options.kmlDistributionFormat, KmlCatalogItem],
[options.geoJsonDistributionFormat, GeoJsonCatalogItem],
[options.czmlDistributionFormat, CzmlCatalogItem],
[options.csvDistributionFormat, CsvCatalogItem]
].filter(function(format) {
return defined(format[0]);
});
var dcatJson = distribution.aspects["dcat-distribution-strings"];
var datasetFormat = distribution.aspects["dataset-format"];
let formatString = dcatJson.format;
if (datasetFormat && datasetFormat.format) {
formatString = datasetFormat.format;
}
var baseUrl = dcatJson.downloadURL;
if (!defined(baseUrl)) {
if (dcatJson.accessURL) {
baseUrl = dcatJson.accessURL;
} else {
return when(undefined);
}
}
var matchingFormats = formats.filter(function(format) {
// Matching formats must match the format regex,
// and also the URL regex if it exists.
return (
formatString.match(format[0]) &&
(!defined(format[2]) || baseUrl.match(format[2]))
);
});
if (matchingFormats.length === 0) {
return when(undefined);
}
var isWms = matchingFormats[0][1] === WebMapServiceCatalogItem;
var isWfs = matchingFormats[0][1] === WebFeatureServiceCatalogItem;
// Extract the layer name from the URL.
var uri = new URI(baseUrl);
var params = uri.search(true);
// Remove the query portion of the WMS URL.
var url = baseUrl;
var newItem;
if (isWms || isWfs) {
uri.search("");
url = uri.toString();
var layerName = params.LAYERS || params.layers || params.typeName;
if (defined(layerName)) {
newItem = isWms
? new WebMapServiceCatalogItem(options.terria)
: new WebFeatureServiceCatalogItem(options.terria);
newItem.layers = layerName;
newItem.url = url;
} else {
// Construct a WMS/WFS CatalogGroup and return the first item
var newGroup;
if (isWms && options.allowWmsGroups) {
newGroup = new WebMapServiceCatalogGroup(options.terria);
newGroup.flatten = true;
} else if (isWfs && options.allowWfsGroups) {
newGroup = new WebFeatureServiceCatalogGroup(options.terria);
} else {
return when(undefined);
}
newGroup.url = url;
newItem = newGroup.load().then(function() {
if (newGroup.items.length === 0) {
return undefined;
} else {
return newGroup.items[0];
}
});
}
} else {
newItem = new matchingFormats[0][1](options.terria);
newItem.url = url;
}
return when(newItem).then(function(newItem) {
if (!newItem) {
return undefined;
}
newItem.name = dcatJson.title;
newItem.info.push({
name: "Distribution Description",
content: dcatJson.description
});
// newItem.dataUrl = new URI(options.ckanBaseUrl).segment('dataset').segment(itemData.name).toString();
// newItem.dataUrlType = 'direct';
if (defined(options.dataCustodian)) {
newItem.dataCustodian = options.dataCustodian;
}
if (typeof options.itemProperties === "object") {
newItem.updateFromJson(options.itemProperties);
}
if (defined(parent)) {
newItem.id = parent.uniqueId + "/" + distribution.id;
}
if (defined(options.zoomOnEnable)) {
newItem.zoomOnEnable = options.zoomOnEnable;
}
knockout.getObservable(newItem, "isLoading").subscribe(function(value) {
try {
if (value === true) return;
if (window.parent !== window) {
window.parent.postMessage("loading complete", "*");
}
if (window.opener) {
window.opener.postMessage("loading complete", "*");
}
} catch (e) {
console.log(e);
}
});
return newItem;
});
};
/**
* Maps catalog item `type` to a short, human-readable identifier of the
* type of distribution accessed (e.g. `wms` maps to `WMS` and `esri-mapServer`
* maps to `MapServer`).
* @type {Object}
*/
MagdaCatalogItem.shortHumanReadableTypeNames = {
wms: "WMS",
"wms-getCapabilities": "WMS",
wfs: "WFS",
"wfs-getCapabilities": "WFS",
"esri-mapServer": "MapServer",
"esri-featureServer": "FeatureServer",
kml: "KML",
geojson: "GeoJSON",
czml: "CZML",
csv: "CSV"
};
MagdaCatalogItem.prototype._load = function() {
var baseUri = new URI(this.url).segment("api/v0/registry");
if (!defined(this.distributionId) && !defined(this.datasetId)) {
throw new TerriaError({
sender: this,
title: "distributionId or datasetId must be specified",
message:
"MagdaCatalogItem requires that either distributionId or datasetId be specified."
});
}
var that = this;
// Construct an array of "previewable" distributions
return when()
.then(function() {
if (defined(that.distributionId)) {
var distributionUri = baseUri
.clone()
.segment(
`records/${encodeURIComponent(that.distributionId)}`
)
.addQuery({
aspect: "dcat-distribution-strings",
optionalAspect: "dataset-format"
});
var distributionUrl = proxyCatalogItemUrl(
that,
distributionUri.toString(),
"1d"
);
return loadJson(distributionUrl).then(function(
distributionJson
) {
if (defined(distributionJson.id)) {
// Success
return [distributionJson];
} else {
return [];
}
});
} else if (defined(that.datasetId)) {
var datasetUri = baseUri
.clone()
.segment(`records/${encodeURIComponent(that.datasetId)}`)
.addQuery({
aspect: "dataset-distributions",
optionalAspect: "dataset-format",
dereference: true
});
var datasetUrl = proxyCatalogItemUrl(
that,
datasetUri.toString(),
"1d"
);
return loadJson(datasetUrl).then(function(datasetJson) {
return datasetJson
.aspects["dataset-distributions"].distributions;
});
} else {
throw new TerriaError({
sender: that,
title: "Error retrieving MAGDA record",
message: "No distribution or dataset ID provided"
});
}
})
.then(function(distributionsToConsider) {
var catalogItemCreatingAttempts = [];
for (var i = 0; i < distributionsToConsider.length; ++i) {
var catalogItemCreatingAttempt = MagdaCatalogItem.createCatalogItemFromDistribution(
{
terria: that.terria,
distribution: distributionsToConsider[i],
magdaBaseUrl: that.url,
wmsDistributionFormat: that.allowWms
? that.wmsDistributionFormat
: undefined,
kmlDistributionFormat: that.allowKml
? that.kmlDistributionFormat
: undefined,
wfsDistributionFormat: that.allowWfs
? that.wfsDistributionFormat
: undefined,
csvDistributionFormat: that.allowCsv
? that.csvDistributionFormat
: undefined,
esriMapServerDistributionFormat: that.allowEsriMapServer
? that.esriMapServerDistributionFormat
: undefined,
geoJsonDistributionFormat: that.allowGeoJson
? that.geoJsonDistributionFormat
: undefined,
czmlDistributionFormat: that.allowCzml
? that.czmlDistributionFormat
: undefined,
dataCustodian: that.dataCustodian,
itemProperties: that.itemProperties,
allowWfsGroups: true,
allowWmsGroups: true,
zoomOnEnable: that.zoomOnEnable
}
).then(function(catalogItem){
if (!defined(catalogItem)) {
var e =new Error();
e.ignore = true;
throw e;
//--- creation function may return undefined.
//--- This should be considered as failed but not report to user.
}else {
catalogItem.name = that.name;
return catalogItem;
}
});
catalogItemCreatingAttempts.push(catalogItemCreatingAttempt);
}
return when.any(catalogItemCreatingAttempts).otherwise(function(e){
var genericError = new TerriaError({
sender: that,
title: "No compatible distributions found",
message: defined(that.distributionId)
? "The MAGDA dataset does not have a distribution with the ID " +
that.distributionId +
" or it does not have a supported format."
: "The MAGDA dataset does not have any distributions with a supported format."
});
if(e instanceof RangeError || !e.length){
throw genericError;
}else{
for(var i=0; i<e.length; i++){
if(e[i].ignore) continue;
throw e[i];
}
throw genericError;
}
});
});
};
module.exports = MagdaCatalogItem;
</code></pre>
</article>
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